Hello Andre,
The output of commands seems correct. The "No readable SSO-Credential" warning appears because the command was executed with dg1adm user and your credential was created to SAPServiceDG1 user (which is the user starting your system, so it is correct).
However, by double checking your traces we can see that you're using SAPCryptolib to configure your environment and it is not supported. Instead, make sure to use CommonCryptoLib (latest patch level):
N SncInit(): found snc/gssapi_lib=E:\usr\sap\DG1\DVEBMGS00\SLL\sapcrypto.dll
N File "E:\usr\sap\DG1\DVEBMGS00\SLL\sapcrypto.dll" dynamically loaded as GSS-API v2 library.
N SECUDIR="E:\usr\sap\DG1\DVEBMGS00\sec" (from $SECUDIR)
N The internal Adapter for the loaded GSS-API mechanism identifies as:
N Internal SNC-Adapter (Rev 1.1) to SAPCRYPTOLIB 5.x
N Product Version = SAPCRYPTOLIB 5.5.5C pl35 (Mar 21 2013) MT-safe
The output shoudl be:
N Product Version = CommonCryptoLib (SAPCRYPTOLIB) Version 8.4...
I hope this clarifies.
Best Regards,
Guilherme de Oliveira
SAP Active Global Support