Hello!
I am getting the following error when trying to access an email that was sent inside Salesforce from a year ago on the Case object. I'm trying to access it on the Activity History related list. This is the error:
Unfortunately, there was a problem. Please try again. If the problem continues, get in touch with your administrator with the error ID shown here and any other related details. You do not have the level of access necessary to perform the operation you requested. Please contact the owner of the record or your administrator if access is necessary.
It doesn't matter if you have admin privileges or not. It also does not give me any error to research. Does it have to do with it being over a year old? I go to a different Case and access an email from January of this year and have no problems viewing it.
If it was stored as a note, that could be an issue too. Since lightning has a “new” notes object. Did you switch objects for emails too? I think it used to log than as email type tasks? That’s all I got though. And yeah I’d log a case. :-)