You should have been given the number when you bought premium support. If you don't have premium support, then there is no telephone support.
You will need to raise it as a support request over at https://support.atlassian.com/contact , but you might want to simply ask here as well - the community is here to help as well as talk.
Atlassian has a pretty good troubleshooting doc on Application Links.
High level things to check:
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