There are many precise ways to define this situation.
Do you have VPN turned on?
Have you done anything for Roblox to temporary block your access(overload API [something like spamming emojis on a message and the system stops you temporarily from doing anything on the site])?
Or either this is a problem on Roblox’s side.
try logging out of roblox and roblox studio, resetting the device, and then logging back on and trying again. if that doesn’t work it is most likely a problem with the app