When you perform SNC logon in SAPGUI, it prompts selection screen for profiles but the correct profile(e.g. Kerberos token) is missing. If there is only Kerberos token and it's missing, error "No credentials was supplied" occurs.
This issue mostly happens after client PC restarts.
SAP Single-Sign On 2.0
SAP Single-Sign On 3.0
Profile, Secure Login Client, SLC, Registry, Kerberos token, Missing profile, users , KBA , BC-IAM-SSO-SL , Secure Login , Problem
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