What you're describing is likely due to your having the GDPR settings turned on in your portal, including the toggle requiring a contact to be subscribed to a type of email to receive it.
With this setting turned on, you are required to opt a contact into a subscription before they can receive emails of that subscription type. You can add a communication subscription to a contact by clicking Add subscription to the Communication subscriptions section of their contact record. Once the correct subscription type has been added, the contact should be able to receive emails.
If you are having trouble saving the communication subscriptions of your contacts, I would recommend logging out and back in again to see if that helps.
What you're describing is likely due to your having the GDPR settings turned on in your portal, including the toggle requiring a contact to be subscribed to a type of email to receive it.
With this setting turned on, you are required to opt a contact into a subscription before they can receive emails of that subscription type. You can add a communication subscription to a contact by clicking Add subscription to the Communication subscriptions section of their contact record. Once the correct subscription type has been added, the contact should be able to receive emails.
If you are having trouble saving the communication subscriptions of your contacts, I would recommend logging out and back in again to see if that helps.