I cannot switch back to my guest account after switching to my primary account

I was added as guest of my client. I was able to see the switch account button beside my profile but the moment I switch to my primary account, the link or button to switch to my guest account disappear.

I need to go back to the email invite I got from my customer just to be able to access my guest account.

Let me know what file do you need from me to check this out.