first() ignores the where clause

@muehleis Confirm that there are records in your Device table that meet both conditions specified in the where clause (user_id and uuid). Executing the query without the first() method and checking if it returns any results

It will make it easier for people to help you if you embrace markdown and wrap your code in backticks to syntax highlight.

If the data exists in your database as @enoch91 alludes to, then try grouping your clauses like so.. (notice the markdown example below)

$device = Device::query()
	->where([
		['user_id', auth()->id()],
		['uuid', $this->codeId],
	])
	->first();

$token = $device->connect_token;// do with as you wish

The mistake is that value() runs a query.

So, first() runs a query and returns a model.

You then do $model->value() which runs a second query using the model as the basis for the query.

Your solution is to use one method or the other, not both.

$code = Device::where('user_id', auth()->id())
            ->where('uuid', $this->codeId)
            ->value('connect_token');

or

$code = Device::where('user_id', auth()->id())
            ->where('uuid', $this->codeId)
            ->first()
            ->connect_token;

Thank you all for your valuable Help!