specialtecken i QR kod

Yes it's with Iphone camera, qrcode scanning apps is working just fine. My customer wants to use the camera in iphone or android.

I'm guessing you are referring to QR codes generated in InDesign are incorrectly read by the iphone using the camera app in IOS 11 or higher. I can't test this as I have an older iPhone, but did try making a QR code out of your first sentence of your post and then tried to decode it using the Quick Scan app. That said, the letters with diacritical marks did not come out as intended - they came out as japanese kanji.

However, the same QR code - exported as a jpg from InDesign and then decoded using online websites such as zxing.org/ , Barcode Reader. Free Online Web Application  , https://www.onlinebarcodereader.com/  all returned correct results.

This needs more investigation. If other readers could test this as well, it can be determined if this is an ID bug or apple camera app bug.

Are your QR codes created with InDesign?

(But please keep in mind this may just be a limitation of your QR scanning app! Try a few other apps as well.)