I had similar issue for MT4 and MT5 in Windows 10 and I fixed it on the following way: I updated Internet Explorer (because the Market
and the Signals are using Internet Explorer).
read post #1238
for more information.

How to Start with Metatrader 5
- 2019.10.03
- www.mql5.com
I decided to create this thread to help to myself and to the others to start with Metatrader 5...

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i cant login to my mql5 account when im using metatrader 4 or 5.
i go to options then community, type in my mql5 email and pass but it wont connect, because i cant see the "signals" and "market" tab in metatrader