The link to Webterminal is this one:
https://web.metatrader.app/ but it is connected to MetaQuotes-Demo server only.
Yes, webterminal is supported MT5 but every broker is having separated link to connect MT5 to the broker's server so ask your broker to support.
So, your broker should have the different link and this link should be provided by broker to you.
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Some more information:
Forum on trading, automated trading systems and testing trading strategies
MetaQuotes, 2021.11.11 12:23
Ask you broker please to update web terminal in their side and provide the link to you.
Now each broker have to have it own web terminal.
Forum on trading, automated trading systems and testing trading strategies
I can not access MT5 in the web version
MetaQuotes , 2021.11.15 14:48
...
Now the new web terminals will be connected only to the trading servers of a specific broker and will not allow connecting to different brokers from the same address. The new web terminal is served on the broker's servers.
This is done for security and legal reasons.
As mentioned above, each broker provides their own MetaTrader 5 Web Terminal separately.
An example of the new MetaTrader 5 Web Terminal is available at https://web.metatrader.app/terminal

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