Currently the account name for the QR image is hardcoded to [prefix]-[account_name]. When e.g. using the email_registration module, it would be nice if the account name is configurable and you could change the account name to the e-mailaddress of the user.
Create a hook e.g. hook_ga_login_qr_account_name_alter and allow the developer to update the account name in a custom module.
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User interface
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It's likely this issue predates Contrib.social: some issue and comment data are missing.
We can likely go a bit further here and allow the fields to be configured by site owners using tokens.