Cannot open application due to insufficiant rights

My customer confirmed, that my username is still listed as collaborateur. My cusomter can open his application. I can open other applications from other custormes where i am collaborateur. How to find out what is wrong here.

{
“code”: 7,
“message”: “error:pkg/auth/rights:insufficient_application_rights (insufficient rights for application test-wismut@ttn)”,
“details”: [
{
@type”: “type.googleapis.com/ttn.lorawan.v3.ErrorDetails”,
“namespace”: “pkg/auth/rights”,
“name”: “insufficient_application_rights”,
“message_format”: "insufficient rights for application {uid}",
“attributes”: {
“missing”: [
“RIGHT_APPLICATION_INFO”
],
“uid”: “test-wismut@ttn”
},
“correlation_id”: “aefe5bf703b747b4950bc430fbfa9573”,
“code”: 7
}
]
}

You should not just be listed as collaborator, but also be granted appropriate rights. See for example:
image
I think the thing marked in pink/purple is the right that you’re seeing the error message about.