My Google account was linked to the Charity shop that I volunteer at - they take photos of items to sell online and I crop/sort/edit them and send them back. I click on my pic on the top right corner of the Google Search page and then click onto the shop account. It has worked until now.
Yesterday I had to clear my Cookies and today all the shop info is gone - the email address and password. I have these details but have no idea of how I input them into Google settings (or whatever).
Could it be that the shop has to send me some sort of 'invitation'?
Well is there anyone else who works with you at the store. You could ask them for the info. I would also say that maybe you should check your screenshots cause there might be something there to help. Or what helped me was when I had lost a log in I remembered that I had logged in to another device so the password was saved.
Hope this helped a little.