Error "OData Server return 401 - Unauthorized error" / Browser is not configured to using SPNego

[thirus11]

Dear Experts,

Could you please help/support on the below error. Recently we have been facing an issue when accessing the SAP Hybrid App in IPAD, After the successful authentication when the call goes to gateway system we are getting this error. More details on the error 

Error "Retrieve metadata failed - OData Server return 401 - Unauthorized error" /

Your Browser is not configured to using SPNego

The connections is via SAP BTP and we are seeing the same error logs in cloud platform. But I am not able to see any logs in gateways system.

Kindly let me know or help me to fix this issue. This is very urgent 

[Ulrich_Schmidt]

To see more details about why the Gateway system refuses the logon, you should increase the ICM trace in the Gateway system: transaction SMICM.

[thirus11]

Dear Ulrich, thank you. Sure will check.

[thirus11]

Dear @Ulrich_Schmidt 

Now we are facing a different issue, Could you please help me here

[Ulrich_Schmidt]

It's still an error from the backend.

a) Can you see the full error message (the screenshot truncates the most interesting part: the body of the HTML response...)
b) ICM trace may still show interesting details about this failed logon attempt.