Thank you for following up on this!
`Selected user account does not exist in tenant 'Microsoft Services' and cannot access the application '....02f9e1bf7b46' in that tenant. The account needs to be added as an external user in the tenant first. Please use a different account``
From the error message, can you make sure that the user account you're trying to sign-in with exists within the same tenant as the application ending with
02f9e1bf7b46? If the user isn't apart of that application's tenant, you'll have to add the users first prior to accessing the app. Additionally, if you didn't use the Quick Start Template to deploy Feathr, I'd recommend making sure you have the correct variables set to ensure there aren't any issues within the feathr_config.yaml.
If you did use the Quick Start Template, can you make sure you used the correct Principal ID when deploying Feathr:
az ad signed-in-user show --query id -o tsv
If you're still having issues, I'd also recommend reaching out to the Feathr community via their Slack Channel or by clicking the invitation link.
If you have any other questions, please let me know.
Thank you for your time and patience throughout this issue.
Please remember to "Accept Answer" if any answer/reply helped, so that others in the community facing similar issues can easily find the solution.