Apologies for bumping old post.
Did you ever get this issue resolved? i am having the same issue, that i have a limit of 2 devices, per user, but these devices are never forgotten, and as a result 3 weeks later a user returns with a 3rd device and is denied access.
My accounts expire after one day rather than your 1 hour, but other than that the issues are the same..
I was following the post and amending my session limits, but i am stuck on the instructions posted by "clembo"
"For your specific guest form to set this value when the accout is created: CPG --> Configuration --> Guest Self-Registration --> Your Page --> Click Form in the Register Page section --> Insert a new field (anywhere) --> Choose simultaneous_use --> Change User Interface to Hidden --> Change Initial Value to 1 --> Save Changes"
I cant see an option to "insert a new field" that gives me the option to choose "simultaneous_use"
Did you follow these instructions and remove the "Unique-Device-Count" limit?