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Model Driven App - How to fix can't sign in error whilst logged in

If you're logged into Power Apps and receive repeated "Can't sign in" errors within specific parts of the designer or app, here's how to resolve the problem.

When building model driven apps, notably those with canvas pages, a problem that can occur is that page component shows a 'Can't sign In' error.

This issue is frequently encountered by PowerUp students, as shown in the screenshot below.



In such situations, clicking OK should re-authenticate using a pop up and enable the app-builder to continue. However, this error occurs on each page reload and is frustrating.

A variation of this error is as follows:
"A Microsoft Dynamics 365 window was unable to open, and may have been blocked by a pop-up blocker. Please add this Microsoft Dynamics 365 server to the list of sites your pop-up blocker allows to open new windows".

The reason for this error is that pop-ups are disabled in the browser. This prevents the authentication pop up from displaying therefore, popups must be enabled to progress this issue.




How to fix this error

The underlying reason for this error is that 3rd party cookies are disabled in the browser.

Therefore, the solution is to enable 3rd party cookies in the browser settings.

Edge Settings

In Edge, go to the "Cookies and site permissions" section of the settings and make sure that 'Block third-party cookies' is disabled as shown below.

The direct link to this setting is here:
edge://settings/content/cookies


Chrome Settings

In Edge, go to the "Privacy and security" section of the settings and make sure that 'Allow third party cookies' is enabled as shown below.

The direct link to this setting is here:



Conclusion

If you receive repeated sign in error dialogs whilst already logged into Power Apps, make sure that 3rd party cookies are enabled in your browser settings.
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