The initial intervals for microsoft defender atp and 365 defender are hard coded to last 5 and 55 minutes respectively. There doesn't seem to be any constraints in the API documentation. I plan on creating a PR to fix this.
Ah, I see this is for the modules, not the integrations. You are right, they are hardcoded - x-pack/filebeat/module/microsoft/defender_atp/config/atp.yml
x-pack/filebeat/module/microsoft/m365_defender/config/defender.yml
I also see your PR [Filebeat] Add Initial Interval for Microsoft Filesets by DumbBoi · Pull Request #42309 · elastic/beats · GitHub
I will make sure it gets reviewed. I would still strongly recommend using out integrations, which have better support, and are easier for users to maintain.
apologies for being MIA. im only using it for testing for now and saw this bug. . I'll update the PR by tonight, hopefully it will get merged soon.