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How to enable SSO with PowerApps portals when there are multiple external identities for the portal

I have a requirement to implement SSO for Power APPs Portal. Here is my scenario

We work with multiple partners. An Azure B2C tenant is used for every Partner.

Now we got 4 different azure b2c tenants one for each partner.

When I open the sign in page on power apps portals it give me lots of buttons on the external sign ins.(one for each identity)


We have a separate citrix style application that all partners can login to . A link to the power apps portal will be available on this.


When a user clicks on the link I want to open the portal directly if the user is already signed in .

I basically need a way to bypass the login page and implement single sign on in Power apps when there are multiple external identities configured .


Can this be done , can someone please point me in the right direction.

Resolver III
Resolver III


can you have a single Azure AD B2C tenant and federate to each partner? 

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