Open the tenant directly to the user
Time to time I loose access to different tenants. We finish projects, we move on to other projects, and sometime I forget that tenant my default tenant. So when I open the Azure portal, I am in a loop of “You don’t have access to this tenant”, and that not allow me to switch to the tenant I want to work with. So I have to open the tenant directly, and then I can switch to the tenant I want to work with. Luckily, there is a way to do that. You can open the tenant directly by using the following URL:
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https://portal.azure.com/something.onmicrosoft.com
yes, thats all :D I can login to the tenant directly, and then I can switch to the tenant I want to work with. This is a simple trick, but it can save you a lot of time and frustration. So next time you lose access to a tenant, just open it directly and you will be able to switch to the tenant you want to work with.
source Ms Q&A