Just a guess here but I’d say you’ve most likely made a configuration error on your OpenVPN Cryptographic Settings section. If you have a different device to test your connection then it will tell you whether the issue is with the server or client.
I have a tutorial on this and even though it’s from 2020 it looks the same. Please note that At the 3:30 mark I meant to say "Leave it at the UDP default, not the TCP Default.
I just deleted the server, used the wizard to recreate it. I deleted the client from my laptop, cleared the old config, and exported the client with the new server config.
I tested by connecting my laptop to my hotspot and cannot connect. I get the same error.