"Office 365 Outlook" connector Error:- REST API is not yet supported for this mailbox. This error can occur for sandbox (test) accounts or for accounts that are on a dedicated (on-premise) mail server.

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Posted on by johnjohn123

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I have built a blank canvas app and i wanted to add "Office 365 Outlook" connector to it, as follow:-

but when i click on connect >> i got this error, as follow:-

Here is the error text:-

REST API is not yet supported for this mailbox. This error can occur for sandbox (test) accounts or for accounts that are on a dedicated (on-premise) mail server.

Session ID: 5f9262de-feb0-4227-bbc0-a37c1ccd863f

Not sure what is the problem exactly? is it related to the fact that the service account i am using to build this "Office 365 Outlook" connector does not have a mail box?

Thanks

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RandyHayes 76,299 Super User 2024 Season 1 on at

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@johnjohn123

That is correct. There must be a mailbox assigned to the user of the app (or maker in this case). Otherwise you will see that error.

I hope this is helpful for you.

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johnjohn123 3,514 on at

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@RandyHayes thanks a lot for the reply.. but need to confirm something, now i am planning to build a power apps which retrieve the outlook events for the login user.. so when i build the Office 365 Outlook connector and sign in using the service account (which will have a mailbox),, then will the displayed events inside the power app be always related to the service account? or to the login user?

Thanks

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RandyHayes 76,299 Super User 2024 Season 1 on at

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@johnjohn123

For that connector, they would always be related to the user running the app.

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johnjohn123 3,514 on at

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@RandyHayesok great this is actually what i am looking for.. so the service account can be used to set the connection only,, while the actual events from the outlook calendar will be depending on the login users? is this correct?

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johnjohn123 3,514 on at

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@RandyHayes can you advice please what do you exactly mean by `they would always be related to the user running the app.` ? are you referring to the service account which Create/Make the power-app/connector Or to the login user who will be Using the power app?

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RandyHayes 76,299 Super User 2024 Season 1 on at

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@johnjohn123

No, those connectors are user specific. They use the current user running the app. There is not any sort of impersonation in PowerApps on those connectors, so they always use the current user. This goes for pretty much all of the connectors. If they ask you to allow such action and do not ask for specific credentials, then they will always use the current user. If they ask for an account and password, then they will be related to that account.

But in the case of the Office 365 and Azure connectors, they will be using the creds of the current user running the app.

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