SSL: Servers certificate chain is incomplete

[Admin]

Unfortunately, there is no way to resolve this on free hosting. This article explains why in more detail:

Warning: "The certificate is not trusted in all web browsers"

If you have installed an SSL certificate on InfinityFree, you may want to use an SSL Checker tool to verify your SSL certificate was installed correctly. However, when doing so, you see an error like this: The certificate is not trusted in all web browsers. You may need to install an Intermediate/chain certificate to link it to a trusted root certificate. Learn more about this error. The fastest way to fix this problem is to contact your SSL provider. What does this warning mean for your sit…

Please also not that using the API from Telegram is not possible on free hosting. It had to be blocked due to rampant abuse (such as spam bots).