We recently moved our site to a new server using Laravel Forge. Everything went well except we keep getting "Use of undefined constant OCI_CRED_EXT" errors because the oci8 extension doesn't seem to be running correctly. Running "php -m | grep 'oci8'" works and echos out oci8, so the extension seems to be running, but when we run a phpinfo() we aren't seeing any of the oci8 configuration. In that info screen oci8 is only listed in the Module Authors.
We followed the instructions here https://gist.github.com/Yukibashiri/cebaeaccbe531665a5704b1b34a3498e (making sure to use the "pecl install oci8-2.2.0" so it works with php 7.4). After that we added some environment variables to /etc/environment as suggested in https://serverfault.com/questions/743976/how-to-detect-php-oracle-using-ubuntu-nginx-php7-fpm.
We are running Ubuntu 20.04 LTS, php 7.4, and Laravel 6.2. At this point I'm running out of things to try. If anybody has any ideas it would be a huge help.