I already had telegram up and running with openHAB. Rules were working perfect for testing purposes. After my tests were finished I disabled the rules.
Now I reactivated them and not a single message is received although the rules are triggered.
After revoking the current telegram token and doing:
according to Telegram - Bindings | openHAB the syntax is https://api.telegram.org/bot<token>/getUpdates which means you need a token.
According to your description you revoked the token and also did not use a token in the URL you used.