Error 526 with Let'sencrypt SSL certificate

Hello. Support wrote to me that in Full strict mode you automatically provide an SSL certificate. Until yesterday everything was in order in this regard. Today, the site https://ikstv.info/ began to show error 526. At the same time, the server of my hosting provider indicated that the SSL certificate also exists and is valid until 02/27/2021. So why does this error occur then?

Hello,

As far as I have checked, https://ikstv.info/ now loads up without any errors or issues.

Moreover, do you have any other issue or this is successfully resolved?