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Hello
Thank you for reporting the issue.
Can you please share the Debug Info given in Advanced Settings section of the plugin?
Also, Please enable logs in Advanced Settings and try again. Then send View log links to our support on Telegram – @WPTelegramSupport.
Please do not share the logs here on the public forum.
Thank you for sharing the logs. It seems to be some temporary issue with Telegram bot API and it has nothing to do with + or [].
You can keep the logs enabled and let us know if you face the issue again.