I removed a certificate and wanted to added it.
But now I can't add it any more. I get a message:
Maximal requests reached for this domain name.
I waited 24h, but still get the same problem/message.
Any help is most welcome 
I've moved your thread to the #help section, where it IMO probably belongs (as you're asking for help). There, you would have been presented with a questionnaire when opening the thread. I'll paste it below, please answer all the questions to the best of your knowledge:
Please fill out the fields below so we can help you better. Note: you must provide your domain name to get help. Domain names for issued certificates are all made public in Certificate Transparency logs (e.g. https://crt.sh/?q=example.com), so withholding your domain name here does not increase secrecy, but only makes it harder for us to provide help.
My domain is:
I ran this command:
It produced this output:
My web server is (include version):
The operating system my web server runs on is (include version):
My hosting provider, if applicable, is:
I can login to a root shell on my machine (yes or no, or I don't know):
I'm using a control panel to manage my site (no, or provide the name and version of the control panel):
The version of my client is (e.g. output of certbot --version or certbot-auto --version if you're using Certbot):
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Thanks for the reply.
Here is the info:
My domain is: Drive.XPertBilling.com
I ran this command: add certificate via Synology NAS
It produced this output: Maximal certificates requests reached for this domain name
My web server is (include version): Synology NAS
The operating system my web server runs on is (include version): Synology NAS
My hosting provider, if applicable, is: Telenet Belgium
I can login to a root shell on my machine (yes or no, or I don't know ): I don't know
I'm using a control panel to manage my site (no, or provide the name and version of the control panel): DSM 7.1
Testing and debugging are best done using the Staging Environment as the Rate Limits are much higher.
And to assist with debugging there is a great place to start is Let's Debug.
https://tools.letsdebug.net/cert-search?m=domain&q=Drive.XPertBilling.com&d=168
| Rate Limit | Current Status | Domain |
|---|---|---|
| 50 Certificates per Registered Domain per week | OK (18 / 50 this week.) | xpertbilling.com |
| 5 Duplicate Certificates per week | Limit exceeded. Next issuable at 27 Feb 2023 17:17:34 UTC | drive.xpertbilling.com |
| Summary generated at letsdebug-toolkit . |
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Also from here https://decoder.link/sslchecker/drive.xpertbilling.com/443 we see:
General Information
| Common Name: | xpbmail.myds.me |
|---|---|
| SANs: | DNS:*.xpbmail.myds.meDNS:xpbmail.myds.me |
Neither match drive.xpertbilling.com
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Also here are community forums for Synology that may be of assistance as well:
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