iOS does not accept response

[mosen]

iOS 11.3 message

Installation failed. Error: NSError:
Desc   : Profile Installation Failed
Sugg   : The SCEP server returned an invalid response.
US Desc: Profile Installation Failed
US Sugg: The SCEP server returned an invalid response.
Domain : MCInstallationErrorDomain
Code   : 4001
Type   : MCFatalError
...Underlying error:
NSError:
Desc   : Profile Failed to Install
Sugg   : The SCEP server returned an invalid response.
US Desc: Profile Failed to Install
US Sugg: The SCEP server returned an invalid response.
Domain : MCInstallationErrorDomain
Code   : 4001
Type   : MCFatalError
...Underlying error:
NSError:
Desc   : The profile “SCEPy Enrolment Profile” could not be installed.
Sugg   : The SCEP server returned an invalid response.
US Desc: The profile “SCEPy Enrolment Profile” could not be installed.
US Sugg: The SCEP server returned an invalid response.
Domain : MCProfileErrorDomain
Code   : 1009
Type   : MCFatalError
Params : (
    "SCEPy Enrolment Profile"
)
...Underlying error:
NSError:
Desc   : The SCEP server returned an inva

[mosen]

Bundle: <private>, key: SCEP_ERROR_INVALID_PKI_RESPONSE, value: (null), table: Errors, localizationName: (null), result: The SCEP server returned an invalid response.