API activation not possible due to SOAP12 entry protocol

Hi everyone,

I am trying to activate a SOAP API on a API Gateway 10.15 on prem instance. I have the following error “Activation failed as soap12 version is not selected in entry protocol”. I try to modify the entry protocol to SOAP 1.2 but when i want to sav it i have the error “Saving API failed Service Error”

I don’t find any information in logs file. Please do you already have this type of issue ?

Best regards