Can anyone please confirm that the ClickSend SMS integration is working as of December 2021

Let me preface this by saying that I am exceedingly grateful for this forum and all the support provided. In light of that, I feel a little sheepish because this is the first time I have failed to figure out a Home Assistant issue by searching the forums.

Having said that, I have searched for and read all the forum posts related to the ClickSend SMS integration. I may be mistaken, but the most recent posts I could find were from last May. The ClickSend SMS integration seems to be straightforward: you sign up on their website with a user name, get an API key, and use that information to configure a notify section in configuration.yaml. Please note that to eliminate any issues related to my username and api_key, I am using ClickSend’s provided “testing” usernames, api keys, and recipient (phone number) in this screenshot, but I get the same response regardless of the username or api_key, or phone number:

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However, when I try to test the notifications service I am receiving an message from the ClickSend API, again regardless of the username, api_key, or recipient:

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I may be confused, but I believe the error message is being returned by the ClickSend API based on their documentation:

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My system is Home Assistant OS running in an Unraid VM without issues for at least a year:

So I am hoping to find another Home Assistant user who can confirm that the ClickSend SMS integration is working. Additionally any suggestions would be appreciated.

Thanks!