External User Access Error

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Posted on by Phineas

5,325 Super User 2025 Season 2

Practicing my Portals.

I've built one; works fine (to me); I've added someone, for test purposes, as an external users with Administrative permissions.

She is getting the following error when she goes to the site. I have set up her account; she has a 'Contact' account; she is under 'Administrator' in permissions.

If I take of permissions and open the site to everyone she can use her Username and password to sign in. Once I require authentification the error message returns.

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Power Apps portals

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ragavanrajan 7,044 Most Valuable Professional on at

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Hi @Phineas

What kind of log in your colleague is using? If it is local login? Did you turn off any site settings recently?

To understand this error bit more. Could you enable the "Disable custom errors" feature? Official article below for reference

https://docs.microsoft.com/en-us/powerapps/maker/portals/admin/view-portal-error-log

Once enabled, try the sync config and browse the website.

Ask your colleague to login again then you will get a yellow screen detailed error. Could you post the screenshot here to help you quickly?

Hope it helps.
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ragavanrajan 7,044 Most Valuable Professional on at

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Thanks for enabling the custom error @Phineas

To make it simple. you can leave all settings as it is in the home page and make sure it is working for you.

For your colleague, the ground rule is to ask your colleague to sign in to the portal via Azure AD or using local login (not recommended) then the portal will create a contact.

Once Contact is created then as an administrator you can assign a web role to her.

In your case, I can see you have created a contact for your colleague.

Hope this will fix your issue.

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