If you can not login as "amadmin" to OpenSSO server, you may want to check following :
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Have you configured OpenSSO instance to point to same DIT as AM 7.x, and used different encryption key than the original AM 7.1 server ?
You have to use same encryption key here.
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Are you authenticating "amadmin" with its password in OpenSSO's user store ?
"amadmin" and its password will be first authenticated against configuration store, i.e. this user and its password should match the "amadmin" user and its password in OpenSSO's configuration store (special users under IdRepo service).
Actual auth module store and / or user store and configuration store could be different as long as above is successful.
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Are you authenticating "amadmin" with its password to sub-realm ?
"amadmin" can only login to top level or root realm.