can not to attach my License key

joomla V3.10..11
mysql 5.5.56
AcyMailing Enterprise : 5.11.4
attach my License key error : An error occurred while calling acymailing.com

I suggest you raise a support ticket for this (https://www.acymailing.com/support/) so we can further assist you.

mihha
OK
I will provide administrator to you later.

We no any firewall to block your IP
just system contact ADSL to internet .
So,Please check again.
Now, still can not to attach my License.

Did you open a support ticket regarding this?

mihha
need to open another ?

If you already did it, then you don't have to open another one. I am just asking did you already do it?