Server-side access token request stopped working

[bolau]

Hi,

For the past months, I've successfully used the Web API to retrieve follower counts and popularity of my Spotify artist.

I requested an access token via https://accounts.spotify.com/api/token (grant_type: client_credentials), and then went on to retrieve the data.

On 2021-10-08, this stopped working all of a sudden. When requesting the access token, I only get this response:

"Your client does not have permission to get URL /api/token from this server. That’s all we know."

I've resetted the secret, no luck. Do you have any idea what I could do to get it to work again? Was there any change in the API on the side of Spotify?

Thanks for any help

Best, Boris