In some of these cases, we might have to log in to your site in order to identify and/or fix the problem – and a public forum is not suitable for sharing private information like login details…
And really discouraged in these forums. To be frank, no one should grant you that access.
*Drinks coffee*
I know you only are seeking to help your plugin user.
But do not request that access as that’s going too far and that is really frowned upon.
You can ask for details, you can walk the user through help, you can make suggestions. Asking for login credential is solid “No” and please do not do that again.
https://codex.www.ads-software.com/Forum_Welcome#The_Bad_Stuff