RequestLink has wrong domain

RequestLink has wrong domain

In the automation section where there are notification rules, the $RequestLink variable is generating a bad URL.  I've read this forum and have tried remove the request link and adding it back.  It's picking up the wrong domain.  It's using a domain we no longer use.  How do we change the domain name that's generated in the $RequestLink variable? The documentation on this by the way is terrible. 

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