Why can't I pair iPhone 8 with Macbook Air?

Reset Network Settings: Only network settings are removed.

• When you reset network settings, previously used networks and VPN settings that weren’t installed by a configuration profile or mobile device management (MDM) are removed. Wi-Fi is turned off and then back on, disconnecting you from any network you’re on. The Wi-Fi and Ask to Join Networks settings remain turned on.
• To remove VPN settings installed by a configuration profile, go to Settings > General > Profiles & Device Management, select the configuration profile, then tap Remove Profile. This also removes other settings and accounts provided by the profile. See Install or remove configuration profiles on iPhone in this guide.
• To remove network settings installed by MDM, go to Settings > General > Profiles & Device Management, select the management, then tap Remove Management. This also removes other settings and certificates provided by MDM. See “Mobile device management (MDM)” in the iOS Deployment Reference.
• Reset your Network Settings. Tap Settings > General > Reset > Reset Network Settings. This also resets Wi-Fi networks and passwords, cellular settings, and VPN and APN settings that you've used before.

If the above fails....

Go to Settings > General > Reset > Reset All Settings

• What this effectively does is to reset some of your Settings to factory default. It’s not a complete removal of settings. It removes all of your preferences for Wi-Fi, Bluetooth, Do No Disturb, Notifications, General, Sounds, Brightness & Wallpaper and Privacy.
• Resetting all settings also reverts all your personalized and customized features like wallpapers and accessibility settings back to factory defaults.
• Performing this action does not impact any of your personal device data, including photos, videos, notes, messages, reminders, emails, calendars, texts, documents, and other files

Enver Masud wrote:

I keep getting "not supported" error message. I can't "unpair" and "pair" the MacBook because it appears under "Other Devices" and does not have "i" next to it. I have Mac OS Monterey 12.4 installed and iOS 15.5.

What are you trying to accomplish by connecting your iPhone and your Mac? Pairing iPhones and Macs over BT has never been supported.

Bluetooth pairing has NEVER been needed or supported between any iOS device and any computer except for tethering the cellular data connection. Apple has not changed anything. That’s how it has worked for 15 years. AirDrop and Continuity make use of Bluetooth, but this use does not require pairing.