Only one guest user can't access workspace

Hi Adam15 ,

Based on the behavior described (user can switch tenant and access the home page, but cannot see any workspaces or open links, and gets redirected back to the original tenant), this typically points to an identity or tenant context issue rather than workspace permissions
.

Please go through the following checks to isolate the issue:

1. Validate Guest User Object
Since the user was previously part of another company you work with, there is a high possibility of a stale or conflicting guest object in your tenant.

Ask your admin to:
Go to Azure AD (Microsoft Entra ID)
Search for the user
Check if there are multiple guest entries for the same person
If duplicates exist:
Remove old/stale guest accounts
Re-invite the user using the current email address

2. Verify UPN vs Email Mismatch
Sometimes access issues occur when the invited email is not same to the user’s actual sign-in UPN

Ask the user to:
Go to Power BI > Profile > check the signed-in account
Confirm it matches exactly the invited guest account

3. Tenant Switching Behavior
Even though the user can switch tenants:
Ask them to explicitly:
Click profile > Switch organization
Select your tenant

Then manually navigate to (https://app.powerbi.com/groups). If it still redirects back, it indicates token/session routing to the home tenant

4. Browser Session / Token Cleanup
Since cross-tenant access relies heavily on authentication tokens:

Ask the user to:
Open an InPrivate/Incognito window
Login only with the guest account or clear cookies

5. Check Default Directory Setting
In some cases, users get redirected due to default directory settings:

Ask the user to go to: https://myaccount.microsoft.com/organizations
Ensure your tenant is listed and accessible
Try launching Power BI from that context

6. Validate External Collaboration Settings

Ask your admin to confirm in Entra ID:

External collaboration settings allow:
Guest access to apps (Power BI)
No restrictions based on domain or device

7. Reproduce with Direct Workspace URL

Provide a direct workspace link: https://app.powerbi.com/groups/<workspaceId>/list
If this still redirects, confirms tenant resolution issue (not permissions)

If all checks pass and issue persists:

Remove the user completely from:
Workspace, Tenant (Azure AD)
Wait for 15-30 minutes for propagation
Re invite fresh and ask user to accept invite in InPrivate session

Hope this helps.