Unable to find a user to enable for Microsoft Lync Server 2010 even though they’re not enabled
Problem
You’re trying to enable a user for Microsoft Lync Server 2010 but cannot find their account listed as you try search for them in Microsoft LyncServer 2010’s Control Panel:

You double check to ensure that their account is listed in Active Directory Users and Computers:

Solution
What I didn’t initially notice was that the account as shown in the screenshot above and below:

… was that the problematic account actually had an Office Communications Server SIP address. I didn’t notice this till I started writing this blog post so I proceeded to open ADSIedit to have a look at the msRTCSIP- attributes of the account because I suspected that LCS or OCS may have been deployed in this environment at one point:

I made a slight mistake with the screenshot above so take my word for it when I say the account on the right, which was an account that was not enabled for Lync, did not have any msRTCSIP- attributes.
The first attempt I made was to simply set the msRTCSIP-UserEnabled attribute to False:

… but this didn’t fix the issue and setting the attribute to Not Set didn’t either.
The next attempt I made was to try and delete value in the msRTCSIP-PrimaryUserAddress but as I tried to hit apply, I got the error:
Operation failed. Error code: 0x57
The parameter is incorrect.
00000057: LdapErr: DSID-0C090A85, comment: error in attribute conversation operation, data 0, vece


The reason for the error above was because I simply deleted the value in the attribute’s field and the proper way to remove that attribute is to actually hit the Clear button which will automatically put the value value into the field as such:

The probably still persisted even after setting the msRTCSIP-PrimaryUserAddress to a value so I proceeded to do the same for the attributes:
the account now showed up in the list of accounts that could be enabled for Lync Server 2010:

You’re trying to enable a user for Microsoft Lync Server 2010 but cannot find their account listed as you try search for them in Microsoft LyncServer 2010’s Control Panel:
You double check to ensure that their account is listed in Active Directory Users and Computers:
Solution
What I didn’t initially notice was that the account as shown in the screenshot above and below:
… was that the problematic account actually had an Office Communications Server SIP address. I didn’t notice this till I started writing this blog post so I proceeded to open ADSIedit to have a look at the msRTCSIP- attributes of the account because I suspected that LCS or OCS may have been deployed in this environment at one point:
I made a slight mistake with the screenshot above so take my word for it when I say the account on the right, which was an account that was not enabled for Lync, did not have any msRTCSIP- attributes.
The first attempt I made was to simply set the msRTCSIP-UserEnabled attribute to False:
… but this didn’t fix the issue and setting the attribute to Not Set didn’t either.
The next attempt I made was to try and delete value in the msRTCSIP-PrimaryUserAddress but as I tried to hit apply, I got the error:
Operation failed. Error code: 0x57
The parameter is incorrect.
00000057: LdapErr: DSID-0C090A85, comment: error in attribute conversation operation, data 0, vece
The reason for the error above was because I simply deleted the value in the attribute’s field and the proper way to remove that attribute is to actually hit the Clear button which will automatically put the value
The probably still persisted even after setting the msRTCSIP-PrimaryUserAddress to a
- msRTCSIP-ArchivingEnabled
- msRTCSIP-OptionFlags
- msRTCSIP-PrimaryHomeServer
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