Adprep error (server 2016 r2 to 2022)

[Clay29IX]

We have 3 DC's with 2012r2 installed. I am planning 2016 r2 dc to 2022 in-place upgrade.For the first step, I ran ADPREP /forestprep CMD in a DC and it returned with the error = adprep failed to verify whether schema master has completed a replication cycle after last reboot --- ADPREP encounter an ldap error.I have checked the administrator rights and have all rights schema. enterprise etc.Here I am trying this from a test machine (I have restored an image backup to the test server) and this machine doesn't have access to any network or to other DC's. Please help me to solve this issue.

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