I can not register for Nextcloud Conference 2024.
I go to Nextcloud Community Conference 2024: Sept. 14-15, Berlin - Register now! - Nextcloud and click “Register now”. Then I fill the form and click “Register now” to submit it. It displays “Processing” in the submit button for about 20-30 seconds and then it complains with “Please use a valid business email address.”. But my address is valid.
Then I tried to contact Nextcloud using the contact form at Nextcloud - Contact us now - same problem: “Please use a valid business email address.”.
The address is valid, definitely. I double checked everything and tried different e-mail-addresses to be sure, that it is not a problem of the domain I use (I have my own domain but also a fallback account at GMX) - none of them worked.
So I believe, something is wrong with your contact form processing.