SCIM API User add/replace Work Phone

curl --request PATCH 
  --url https://platform.devtest.ringcentral.com/scim/v2/Users/283100004 
  --header 'accept: application/json' 
  --header 'content-type: application/json' 
  --data '{"schemas":["urn:ietf:params:scim:api:messages:2.0:PatchOp"],"Operations":[{"op":"replace","path":"phoneNumbers[type eq "work"].value","value":"+4989700755555"}]}'

{  "schemas": [    "urn:ietf:params:scim:api:messages:2.0:Error"  ],  "status": "403",  "detail": "The operation(add) for path(phoneNumbers[type eq "work"].value) is not permitted" } 

Okay, hopefully my last question: have created a User using the SCIM API without stating a work phone, so the user only hast a phone number of type "other" and later added "mobile".
Now I want to add the work phone, but the API does not allow it.
Is that possible somehow?

We are thinking about migration scenarios, adding the user first without his real phone number and when the carrier is ready switching to RingCentral by adding the phone number to the user.