Can't fetch employe data via API

Hello,

i have writen a script to fetch employe data to calculate provisons. This scrip runs just fine until this week. Now i get:
{
"success": false,
"error": {
"message": "Provided authorization is not valid",
"code": 401
}
}

I controled API credentials right configuration but nothing changed in more than a year.
Has something changed in the API?
I also tryed the credentials on:
https://developer.personio.de/reference/get_company-employees

Authentication give me an bearer token but in get the same error respons as my script.

Kind regards

Manuel Helmbrecht