SAP BTP Custom IDP returning /saml-error without any error details for Business users

[krk-ro]

We have implemented a custom IDP for one of our subaccount as Business users, but during Authentication it returns /saml-error, When a get request is fired for "/saml-error" it gives only attribute value without any details.

How to identify what went wrong and where can I find the Custom IDP logs?

[CarlosRoggan]

If you're using IAS as custom IdP, then you can find more info in the Troubleshooting logs

[krk-ro]

Not using any IAS.

Only Custom IDP, with roles like (PI-Integration Developer) assigned to attribute.

Is it possible to use logs as specified in 2942816 - How to export and self-analyze Troubleshooting logs from Identity Authentication - SAP for... if only Custom IDP is used?

I am going through the blog: SAP BTP Security: How to handle Authorization and Attributes [2] with XSUAA and IAS | SAP Blogs to find more details.

[CarlosRoggan]

if the error occurs after login in BTP, thrown by XSUAA, then it is very difficult to get the logs: as a normal user, we don't have access to XSUAA logs ;-(

I'm not familiar with custom IdP other than IAS, I'm sorry