Dear @Max ,
either the API works or not. I do not know about any feature to enable only specific API functions.
Most probably you are facing a permission issue. Can you create an issue by using the same credentials when within the browser?
If you can, can you please post the API call inclusive JSON body?
When you're fetching an issue, you're using a GET call. For creating an issue, you should be using a POST call - is that what you're using?
You say you're not able to create an issue, but what happens? Please show us the JSON you're using to POST and the returned JSON / error message
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