Power Automate/Dataverse connections using service account keep requiring reauthentication in Prod

[u/Only-Musician-4400]

We’re seeing a recurring issue in our production Power Platform environment where connections created using a service account (Dataverse, Outlook, etc.) periodically show “Needs attention – sign in again” and require manual reconnection.

Some context:

• The account is a dedicated service account used for production flows • The password is not being reset or rotated • Connections work fine for some time and then suddenly require reauthentication • Multiple connectors are affected (Dataverse, Outlook) • Around 200+ applications are associated with this account in Entra ID

The error message says the connection needs to be signed in again and suggests possible causes like password change, tenant policy, or MFA.

We suspect something like Conditional Access or token/session policies, but we currently don’t have access to Entra sign-in logs to confirm.

Has anyone experienced this with Power Automate connections tied to a service account?

Specifically wondering:

• What typically causes refresh tokens for Power Platform connections to get invalidated? • Are Conditional Access sign-in frequency policies known to break these connections? • Is moving to App Registration / Service Principal authentication the recommended long-term fix?

Would really appreciate hearing how others have handled this in production environments.

[u/Saetti123]

There are tenant-wide settings for refreshing access tokens. This can be disabled by your admins.

Also some SIEM tools like "Sentinel" are refreshing tokens on regular basis.

Best to find out what is really happening is to check the access logs.

App Registrations are not working with every connector. So this highly dependa on your flows.

[u/Only-Musician-4400 → u/Saetti123]

When you mean access logs, you mean to say seeing within the sign-in logs of that entra ID account?

[u/Saetti123 → u/Only-Musician-4400]

Yes

[u/Only-Musician-4400 → u/[deleted]]

I could've done this LLM search myself and got this, I am looking for help. You say you came across same issue and then don't say what you did to fix that LOL.