Trouble registering browser and device with Send2cgeo

[eddiemuc]

From support Ticket #478043:

I'm having trouble registering my browser and device with Send2cgeo.
After installing the "Tampermonkey" add-on to the PC, I run https://www.cgeo.org/send2cgeo.html
Click on "Register broker" and the name change will be OK.
After requesting registration on the phone, a PIN is generated, which I then enter in the field for adding a device on the PC. It will transfer correctly from the phone and fill in the device name on the PC page. Unfortunately, after sending the pin, the error messages "Error, device NOT addend ..." and ""Problem adding your device! (#2)”.
Repeating the attempts always ends with the same result.
Can you please advise me how to solve the problem?
Thanks in advance for your reply,

[capoaira]

I cannot reproduce it (Linux Mint, Firefox). Do we have information about OS and Bowser?
But I noticed that the server is very slow...
(btw, I don't think that it has something to do with Tampermonkey)