Please try to open copay on another mobile phone and see if it gonna work, some countries may block access to bitpay servers which are few, to avoid country citizens using bitcoin.

if so, try to install some VPN software and try again. if still doesn't work, you have to open an issue here https://github.com/bitpay/copay/issues with more details about your mobile phone.

if you don't want to do so, you can install copay on your laptop or any other device and import your mnemonic phrase there.