fresh install from docker bug with capitalize letters in email

[grand-lotus-iroh]

If you type in email with capital letter, you get error

"Invalid email or password"

and than it redirects and is broken and you must remove and redeploy with docker command

[YuriySamorodov]

Can confirm the same issue.

Workaround:
In my case making both email, user name and nickmame lowercase allowed me to login successfully.
It happily accepted upper case letters, special characters and digits for password though.

Environment:

Linux 1764207385511 6.8.0-88-generic #89-Ubuntu SMP PREEMPT_DYNAMIC
Docker version 29.0.4, build 3247a5a
Nginx Proxy Manager Version 2.13.5 (847c58b) 2025-11-18 11:25:13 UTC, 
OpenResty 1.27.1.2
Certbot certbot 5.1.0