Forgotten mail bugged can’t collect items

Now i didn’t have room to keep collecting the gems so i let them go to my mail and claim them as forgotten item. Now i go to mail to claim these items and it won’t let me get my gems out of the mail i need this solved ASAO

If you’re having trouble logging into your Google account because you can’t remember your email address, go to Google’s Find My Email page and follow the prompts. You’ll need to be able to provide the full name associated with your account, as well as the phone number or the recovery email address associated with it.