Getting "Enter the password for your Apple ID to continue using iMessage on this Mac" every time I log in

Hi iamzain,

You'll want to look in your Messages preferences to make sure you're signed in with the right Apple ID there. Here's how to do that:

"Set up iMessage

1. In the Messages app  on your Mac, enter your Apple ID and password, then click Sign In.

• Make sure to sign in using the same Apple ID on every device. See the Apple Support article Use Continuity to connect your Mac, iPhone, iPad, and Apple Watch.
• If you forgot your Apple ID or password, or if you need to create an Apple ID, go to the Apple ID account website.

2. Choose Messages > Settings, click iMessage, click Settings, then select any of the following options:

• Enable Messages in iCloud: Select this option if you want to store your messages in iCloud. See Access your messages on all your Apple devices.
• You can be reached for messages at: Select the email addresses or phone numbers that people can use to send you messages.
  • See the Apple Support article Add or remove your phone number in Messages or FaceTime.
• Send read receipts: Select this option so that people who send you messages can see when you’ve read them.
  • You can also send read receipts for a specific conversation.
• Start new conversations from: Choose the email address or phone number that you want to use for starting new conversations.
  • This option is only available if you have more than one email address or phone number listed below 'You can be reached for messages at.'"

You can read the full resource here: Set up Messages on Mac

Take care.