Hello guys,
after simple configuration of my telegram notification I got this error.

and in the log I see this:
t=2021-05-26T09:03:55+0300 lvl=info msg=“Sending telegram notification” logger=alerting.notifier.telegram chat_id=-*** bot_token=bot****** apiAction=sendMessage
t=2021-05-26T09:03:55+0300 lvl=eror msg=“Failed to send webhook” logger=alerting.notifier.telegram error=“Webhook response status 404 Not Found” webhook=Telegram_Notification
t=2021-05-26T09:03:55+0300 lvl=eror msg=“failed to send notification” logger=alerting.notifier uid= error=“Webhook response status 404 Not Found”
t=2021-05-26T09:03:55+0300 lvl=eror msg=“failed to send notification” logger=alerting.notifier uid= error=“Webhook response status 404 Not Found”
t=2021-05-26T09:03:55+0300 lvl=eror msg=“Failed to send alert notifications” logger=context userId=1 orgId=1 uname=admin error=“Webhook response status 404 Not Found” remote_addr=213.145.103.137
t=2021-05-26T09:03:55+0300 lvl=eror msg=“Request Completed” logger=context userId=1 orgId=1 uname=admin method=POST path=/api/alert-notifications/test status=500 remote_addr=213.145.103.137 time_ms=197 size=48 referer=http://94.26.36.3:8080/alerting/notification/3/edit
Some idea where can be the problem? I`m using Grafana version v7.5.7 (91de51771c) with InfluxDB everything is installed on Oracle Linux 8 with stopped SeLinux.