Elastic 401 error after upgrading to version 7.5.1

Hi Team, i am new to this system, I had upgraded from version 6.3.2 to version 7.5.1 and now i get the below error on all 3 nodes:

{"error":{"root_cause":[{"type":"security_exception","reason":"missing authentication credentials for REST request [/]","header":{"WWW-Authenticate":["Bearer realm="security"","ApiKey"]}}],"type":"security_exception","reason":"missing authentication credentials for REST request [/]","header":{"WWW-Authenticate":["Bearer realm="security"","ApiKey"]}},"status":401}

This is what my startup log shows:
[2020-07-27T15:23:41,154][INFO ][o.e.p.PluginsService ] [vldes01.discsrv.co.za] loaded module [x-pack-voting-only-node]
[2020-07-27T15:23:41,154][INFO ][o.e.p.PluginsService ] [vldes01.discsrv.co.za] loaded module [x-pack-watcher]
[2020-07-27T15:23:41,155][INFO ][o.e.p.PluginsService ] [vldes01.discsrv.co.za] no plugins loaded
[2020-07-27T15:23:46,375][INFO ][o.e.x.s.a.s.FileRolesStore] [vldes01.discsrv.co.za] parsed [0] roles from file [/usr/local/applications/configs/ES/x-pack/roles.yml]
[2020-07-27T15:23:47,050][INFO ][o.e.x.m.p.l.CppLogMessageHandler] [vldes01.discsrv.co.za] [controller/53340] [Main.cc@110] controller (64 bit): Version 7.5.1 (Build ae3c3c51b849be) Copyright (c) 2019 Elasticsearch BV
[2020-07-27T15:23:47,706][DEBUG][o.e.a.ActionModule ] [vldes01.discsrv.co.za] Using REST wrapper from plugin org.elasticsearch.xpack.security.Security
[2020-07-27T15:23:47,863][INFO ][o.e.d.DiscoveryModule ] [vldes01.discsrv.co.za] using discovery type [zen] and seed hosts providers [settings]
[2020-07-27T15:23:49,020][INFO ][o.e.n.Node ] [vldes01.discsrv.co.za] initialized
[2020-07-27T15:23:49,020][INFO ][o.e.n.Node ] [vldes01.discsrv.co.za] starting ...
[2020-07-27T15:23:49,206][INFO ][o.e.t.TransportService ] [vldes01.discsrv.co.za] publish_address {}, bound_addresses {}, {[fe80::250:56ff:fe86:fc39]:9300}
[2020-07-27T15:23:49,664][INFO ][o.e.b.BootstrapChecks ] [vldes01.discsrv.co.za] bound or publishing to a non-loopback address, enforcing bootstrap checks
[2020-07-27T15:23:49,671][INFO ][o.e.c.c.Coordinator ] [vldes01.discsrv.co.za] cluster UUID [reVwlwHpR7SN0jza8bt7sg]
[2020-07-27T15:23:51,251][INFO ][o.e.c.s.ClusterApplierService] [vldes01.discsrv.co.za] master node changed {previous , current [{vldes02.discsrv.co.za}{AlhOgxWeSfqZO5icrOiCXg}{Qco3I28hSR6-6hjODCScQg}{}{}{dilm}{ml.machine_memory=16637550592, ml.max_open_jobs=20, xpack.installed=true}]}, added {{vldes02.discsrv.co.za}{AlhOgxWeSfqZO5icrOiCXg}{Qco3I28hSR6-6hjODCScQg}{}{}{dilm}{ml.machine_memory=16637550592, ml.max_open_jobs=20, xpack.installed=true},{vldes03.discsrv.co.za}{HUYGjqM_RM6sT-v_h1-q6A}{1RR3aUeHS2CgQzjzu_-8WQ}{}{}{dilm}{ml.machine_memory=16637550592, ml.max_open_jobs=20, xpack.installed=true}}, term: 6, version: 6684, reason: ApplyCommitRequest{term=6, version=6684, sourceNode={vldes02.discsrv.co.za}{AlhOgxWeSfqZO5icrOiCXg}{Qco3I28hSR6-6hjODCScQg}{}{}{dilm}{ml.machine_memory=16637550592, ml.max_open_jobs=20, xpack.installed=true}}
[2020-07-27T15:23:51,284][INFO ][o.e.c.s.ClusterSettings ] [vldes01.discsrv.co.za] updating [xpack.monitoring.collection.enabled] from [false] to [true]
[2020-07-27T15:23:51,561][INFO ][o.e.x.s.a.TokenService ] [vldes01.discsrv.co.za] refresh keys
[2020-07-27T15:23:52,035][INFO ][o.e.x.s.a.TokenService ] [vldes01.discsrv.co.za] refreshed keys
[2020-07-27T15:23:52,302][INFO ][o.e.l.LicenseService ] [vldes01.discsrv.co.za] license [b243ae51-4672-4319-967d-1cda3a3cccd4] mode [platinum] - valid
[2020-07-27T15:23:52,303][INFO ][o.e.x.s.s.SecurityStatusChangeListener] [vldes01.discsrv.co.za] Active license is now [PLATINUM]; Security is enabled
[2020-07-27T15:23:52,314][WARN ][o.e.l.LicenseService ] [vldes01.discsrv.co.za] License [will expire] on [Saturday, August 15, 2020].

If you have a new license, please update it. Otherwise, please reach out to

your support contact.

Commercial plugins operate with reduced functionality on license expiration:

- security

- Cluster health, cluster stats and indices stats operations are blocked

- All data operations (read and write) continue to work

- watcher

- PUT / GET watch APIs are disabled, DELETE watch API continues to work

- Watches execute and write to the history

- The actions of the watches don't execute

- monitoring

- The agent will stop collecting cluster and indices metrics

- The agent will stop automatically cleaning indices older than [xpack.monitoring.history.duration]

- graph

- Graph explore APIs are disabled

- ml

- Machine learning APIs are disabled

- logstash

- Logstash will continue to poll centrally-managed pipelines

- beats

- Beats will continue to poll centrally-managed configuration

- deprecation

- Deprecation APIs are disabled

- upgrade

- Upgrade API is disabled

- sql

- SQL support is disabled

- rollup

- Creating and Starting rollup jobs will no longer be allowed.

- Stopping/Deleting existing jobs, RollupCaps API and RollupSearch continue to function.

- transform

- Creating, starting, updating transforms will no longer be allowed.

- Stopping/Deleting existing transforms continue to function.

- analytics

- Aggregations provided by Analytics plugin are no longer usable.

[2020-07-27T15:23:52,356][INFO ][o.e.h.AbstractHttpServerTransport] [vldes01.discsrv.co.za] publish_address {}, bound_addresses {}, {[fe80::250:56ff:fe86:fc39]:9200}
[2020-07-27T15:23:52,356][INFO ][o.e.n.Node ] [vldes01.discsrv.co.za] started

How do I resolve this and what should i send to you to help me investigate this?

HI ALL, any idea why i still get this error message?
I have updated the license to what we have purchased.

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