When users self-register on Telescope, they get a welcome email with their username and password but the username and password have a trailing period(.) character behind them, which wasn't needed and users had to drop the period character to use the credentials.
This issue was fixed in Telescope Standard 2020.1 and it is recommended to upgrade your TeleScope version to this or later to fix this issue. If your TeleScope installation has customizations or you're an OnDemand customer, please contact your Account Manager or support for help with upgrading.
Once Telescope is upgraded, any users self-registering should be getting the credentials without the trailing period character, saving on the confusion.