The certificate is not trusted in all web browsers, expired certificate in Certificates

After run, I get fullchain.pem and I config my nginx like this:

ssl_certificate /config/acme-certs/healinglive.net/fullchain.pem;
ssl_certificate_key /config/acme-certs/healinglive.net/key.pem;

Every thing run well until I visit the domain on SSL Checker.
It tell me " 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."

And I get more information on "check-your-website.server-daten.de", I see this below.
I think I need help to solve it now.

healinglive.net - Make your website better - DNS, redirects, mixed content, certificates

My domain is: healinglive.net

My web server is (include version): nginx/1.22.1

The operating system my web server runs on is (include version): Linux 3f2de2d4a200 5.4.0-26-generic #30-Ubuntu SMP Mon Apr 20 16:58:30 UTC 2020 x86_64 GNU/Linux

I can login to a root shell on my machine (yes or no, or I don't know): yes

you are using certificate from staging server. why? what's your acme client?

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(post deleted by author)

Actually I use the jitsi build-in acme, here is the doc. Self-Hosting Guide - Docker | Jitsi Meet

I don't know what the exact client is, and I will try to find it out later.
I would be very plaesure if you could tell me some tips on how to find it.

When you move away from LETSENCRYPT_USE_STAGING, you will have to manually clear the certificates from .jitsi-meet-cfg/web.

this looks related to me

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Thank you very much.
Can you tell me the difference between staging server and a regular server, and what it's used for? Or provide some reference document links?
I would like to learn more about these things.
Thank you again.

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I think I understand now, thank you.
Some :tangerine: :tangerine: :tangerine: :tangerine: :tangerine: :tangerine: for you, so you can make more pizzas :grin:. Wish you have a nice day.

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