The following actions uses node12 which is deprecated and will be forced to run on node16: actions/checkout@v2, actions/setup-dotnet@v1. For more info: https://github.blog/changelog/2023-06-13-github-actions-all-actions-will-run-on-node16-instead-of-node12-by-default/

Cannot convert null literal to non-nullable reference type.

Non-nullable property 'SendGridUser' must contain a non-null value when exiting constructor. Consider declaring the property as nullable.

Non-nullable property 'SendGridKey' must contain a non-null value when exiting constructor. Consider declaring the property as nullable.

Non-nullable property 'PostmarkKey' must contain a non-null value when exiting constructor. Consider declaring the property as nullable.

Non-nullable property 'PostmarkDomain' must contain a non-null value when exiting constructor. Consider declaring the property as nullable.

Non-nullable property 'MailGunKey' must contain a non-null value when exiting constructor. Consider declaring the property as nullable.

Non-nullable property 'MailGunDomain' must contain a non-null value when exiting constructor. Consider declaring the property as nullable.

Converting null literal or possible null value to non-nullable type.

Dereference of a possibly null reference.