"login my account on MT5" - means: fill Community tab in Metatrader?
If yes so use your forum login (your forum login is wildermellotto;; do not use your email for login).
Some other reasons: read summary post #1 and this post #1 with all the reasons explained and what to do for example.

On File Menu am unable to Login to Community from MT4
- 2020.03.15
- www.mql5.com
I don't know what the problem is... Help please...

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Hi
I'm facing issues to login my account on MT5. I can connecto to my broker, deal without problems. I can connect my MQL5 account using web browser, and my credentials passwd without problem on web browser.
The issue is when I try to connect my MQL5 account on MT5, always get error with credentials and I can't download any Indicators.
Anyone can help me?