The issue: unable to Sign Out from Dynamics 365 portal.
Symptoms: logged in portal user remains signed in even after signing out from the portal.
This is, actually, a very convenient “feature”, if you always work with a portal from your personal computer (like I do). However, if you share the same desktop with your colleagues, you may want log out from the portal, once you’ve finished your session. Unfortunately, it wasn’t an option till the last week.
We were happy to receive the following email from Microsoft:
Hi Olena,
Good day.
As confirmed by PG, we need t configure below value in Portal -> Set Settings for external logout.
Set “Authentication/OpenIdConnect/AzureAD/ExternalLogoutEnabled” = true
I have tried on my testing environment, it works. Please feel free to apply this solution on your end. If you have any question, feel free to let me know.
Thanks,
I went to test this on our portal. It seems to be working now.
Something Awesome About ... Power Platform and BizApps..Dev and Ops 
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Excellent blog here! Also your site quite a bit up very fast! What host are you the use of? Can I am getting your associate link for your host? I want my site loaded up as fast as yours lol
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Reblogged this on Debajit's Dynamic CRM Blog and commented:
3 years old but still worth in gold. If you are facing issues related to signout with external login provider in PowerApps/ Dynamics 365 Portals, then follow this. Excellent blog by Olena!
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