How to stop 'software was updated' message and fix search issues after macOS Tahoe upgrade?

HWTech wrote:

Is this Mac being managed by an MDM? When I saw your picture, it made think of an MDM update panel due to the icon on it. I haven't installed any software updates yet on my Tahoe test system.

Interesting observation 🦉-53

Is this Mac being managed by an MDM? When I saw your picture, it made think of an MDM update panel due to the icon on it. I haven't installed any software updates yet on my Tahoe test system.

Welcome

OP wrote " I am using a mac mini m4 with OS Tahoe 26.1

I have the issue that every time after I restart I get the message that my software was updated. "

Perhaps a Screen Shot of this " I get the message that my software was updated. "

In theory and predicated on the Tahoe 26.1 was actually installed

It is difficult to see why this message should be presented

At least on 1 M4 Desktop, 1 M4 Laptop and 1 M2 Desktop each updated to 26.1

Not getting this message

Go figure

Ok and what happened when you clicked on " Continue " lower right of your image

I quote from a colleague of mine @ Ingo2711 who seems to have the answer to your question

If this works and hope it does

Any and all credit goes to my colleague

Refer Persistent message alert on System Settin… - Apple Community

Quote " I would suggest to log out of the Apple Account on both devices, restart them and log into the Apple Account again.

Since my MacBook Pro could not be upgraded beyond Catalina, when this happened in the past, I guess that newer Apple Account features on one device require to log out and log in on all connected devices. Especially when you use Passwords or FindMy, which sync information across different firmware versions. " END Quote

The series of images from 1st to 3rd looking like the normal process from Setup Assist

Completely normal

That is, if you had chosen and successful established a Wifi Connection