Error occurred on sending fax. UserName, Password or IP Address failed login validation.

Error Message:
Error occurred on sending fax
Login not successful. UserName, Password or IP Address failed login validation.
Organization ID: XXXXXXXXXX
Organization Fax Number: 866XXXXXX
Fax SFID: XXXXXXXXXX

Reply:
If you see this error message, please contact support. In case detail, copy/paste the full error you received which should show your Salesforce organization ID and assigned fax number through Opero Fax app. With these details, support team can investigate and resolve for your fax number settings.