Messages issue on my Mac

Hi Lahm08

welcome to the Apple (user-to-user) Community.

Re: "Imessage issue: All of a sudden, I'm unable to use imessage on my mac, same as my phone".

Check you are signed in (to your iPhone) and (to your Mac) with your correct Apple ID:

How to: Sign in with your Apple ID - Apple Support

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Wondering which iOS version is installed on your iPhone 14 Pro:

Eg: Apple support's article About iOS 17 Updates - Apple Support says iOS 17.3 is the latest update.

"This update introduces additional security measures..." :

To check if the update is waiting to be installed, try: Settings > General> Software update

Else if you are already using iOS 17.3 on your iPhone:

Try restarting your iPhone: Restart your iPhone - Apple Support (re-establishes connections, deletes temporary files, often restores order.)

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Re: "On mac, I can't set it up at all. I need help please and who knows what might be the issues".

On Mac: Check whether an update is waiting to be installed:

Eg: Apple menu > System Preferences or System Settings > General > Software update.

If your Mac has the newest compatible update already: try Apple menu > Restart

After waiting for Mac to restart: Log back in to your Mac and check if Messages works ok.

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Re: "Although once a while the messages get delivered as Blue, but most times its green".

Green bubbles are text messages using cellular data. (Eg: Android phones)

Blue messages are iMessages from Apple to Apple devices using wi-fi.

See: What to do: If your iPhone or iPad won't connect to a Wi-Fi network - Apple Support

and

Connect iPhone to the internet - Apple Support

You may need to restart your modem / or check with your internet provider

If you can’t connect to a Wi-Fi network on Mac - Apple Support

or

If your Mac isn't connecting to the internet over Wi-Fi - Apple Support 

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Re: "I can't log in or connect icloud to the "messages' in settings".

You may need to check if you are connected to wi-fi

Else, if connected ok:

See: What to do: If you can’t turn on or sign in to iMessage or FaceTime on your iPhone - Apple Support

and

If you can't sign in to your iMessage account or FaceTime on your Mac - Apple Support

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If needed:

How to: Set up iCloud for Messages on all your devices - Apple Support

Apple Messages Support Webpage: (info / support / contact options etc.)

Messages for iPhone, iPad, Apple Watch, and Mac - Official Apple Support

All the best :-)