Any experts on generating CUrls via postman for Joomla J4?

[Boommerrang]

Any experts on generating CUrls via postman for Joomla J4?
I have an error not knowing where it depends on.
Generated 3 different workspaces in postman.
Added same Joomla4 Web Services API Collection to each of them.
Entered API Token and Website Data to each workspace (double checked correct API token etc. to fit the exact website).
Two websites work properly, I can get any code and JSON response I need to work with.
Only the third always throws back an 500 internal server error and I don't know why?
Is there anything or a hint I can get where to look at for resolving?

[mindphp]

you can user postman of gen curl request
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