Time out while trying to connect to Nextcloud at https://example.com

I have used the same server address “https://example.ddns.net” on both the snap and flatpak version and the issue displays "Time out while trying to connect to “https…”.

I have used this exact same url and method to connect my windows machine and phone without an issue.

I am running Fedora 30 on Deepin Desktop.

Has anyone else run into this issue on linux?

Is port 443 opened in your router and forwarded to your NC box?