First thing first, I would reinstall it, or make sure that you have an updated version. It sounds so miniscule, but it usually does the trick. If that does not work, I would contact Skype technical support.
Before doing so here is the standard list FYI:
To
make a video call, you and the person you are calling will need:
Here is the connections trouble shoot website:
https://support.skype.com/en-us/category/CONNECTION_ISSUES/
but definitely, if all requirements are met, I would give Skype a call :]
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