You could try going to the Power Apps portal page > Data > Connections and then find the connection and click on the three dots > switch accounts and see if that works.
For some reason the user does not have access to this section even after we have shared the app with him.
In fact he doesn't even have access to the environment.
Also looking for this solution, interested to know if it is possible to achieve this with e.g. Edit Connector Role Assignment ref: Power Apps for Makers - Connectors | Microsoft Docs
I actually found the solution and it was not in the place I would have thought to look. Have the user download the mobile app for either iOS or Android. Log in with your work account. On the list of the apps, there is an "i" in a circle to the far right. Here you can change the user connection for that app. Would not have thought this would have been in the mobile app.
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