Skype account cant connect to skype for business account

im trying to connect to a skype account to antoher users lync / skype for business account.

I wont let me connect. if i search for the user i can see it but id a send a freindrequest he never gets it.

What to do?
ACAsked:
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David Johnson, CD, MVPOwnerCommented:
you are both using skype for business?? skype and skype for business are two entirely different products
ACAuthor Commented:
Hi, i know but it sould be possible to connect says Microsft.  The om client is an Skype for business, the other is an original Skype account
David Johnson, CD, MVPOwnerCommented:
There are many caveats
https://technet.microsoft.com/en-us/library/dn440175%28v=ocs.15%29.aspx

Skype users must be logged into their Skype client with a Microsoft Account (MSA).
Lync users must be enabled for public IM connectivity by their Lync administrator.
When a Skype user adds a Lync contact, verify that the word Lync appears below the contact’s name. This indicates that a Lync URI has been found.
When a Skype user adds a Lync contact and zero search results are returned for that Lync domain, the PIC provisioning process may not have completed, or the Lync domain has not yet been set up.
Depending on the privacy settings of the Lync and Skype users, IM, video, and presence may not work until the new contacts are accepted by each user.

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