[Feature Request] Authority Validation enhacements

[bgavrilMS]

This is a consistency item.

Spec is here: https://microsoft.sharepoint.com/:w:/t/ADAL/ESzbQvzlMuBDjAsqfaHdjNUBsTmwIUR5g17IAY4rvOY_Hw?e=7dv5hZ

Tasks

• Implement phase 2 WithInstanceDiscoevryEndpoint("DISABLED") which turns off all instance discovery
• Ensure ESTS-R scenarios work in conjunction with this setting
• Testing

@rayluo to confirm that only phase 2 is required and if phase1 ("WithKnownAuthorityHosts") is optional / recommended etc.

[rayluo]

@rayluo to confirm that only phase 2 is required and if phase1 ("WithKnownAuthorityHosts") is optional / recommended etc.

Yes. Also, that internal specs grew along with the lengthy conversation. If you just want to focus on what ended up happening, this implementation PR in MSAL Python shipped only a boolean instance_discovery=True or False. You can for example take a look into its unit test cases.