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If you successfully connect the Apple AirPods Pro with the iPhone, the battery charge levels of the individual headphones and the charging case are shown, among other things. However, it can also happen that an AirPod Pro also has a red exclamation mark and the "L" or the "R" is displayed in a red circle. If the iPhone shows a red exclamation mark on one of the earphones, this can indicate dirt on the charging contact - or a bug in the software that Apple has to fix with an update.
The problem is actually already known from previous generations of Apple AirPods (without "Pro"). I myself had the warning message displayed on my iPhone in March, but was able to solve the problem relatively easily: here is my contribution to it. Basically, you just had to blow out the charging case and wipe the AirPod charging contact. Then everything worked again after a short wait.
The same can also be the case if you get a red exclamation mark on the iPhone with the new AirPods Pro. If, in addition to the notice, there are also restrictions in use, it may actually be that the battery of the earplug in question cannot be charged properly. After cleaning, put it in the fully charged charging case for a few minutes and see if something happens.
Since the error message in the form of exclamation marks piles up in the AirPods Pro overview on the Apple smartphone, it seems to be a software error. Various sources report that several users have already commented on the topic and that the AirPods Pro would work despite the error display or despite the warning.
If this is also the case with you, then you can continue to use the headphones as normal. The warning should disappear sometime after an update of the headphones or after a bug fix for iOS. However, it is not yet clear whether and when the fix will appear, as Apple - at least to the best of my knowledge - has not yet commented on the issue.
Jens has been running the blog since 2012. He appears as Sir Apfelot for his readers and helps them with problems of a technical nature. In his free time he drives electric unicycles, takes photos (preferably with his iPhone, of course), climbs around in the Hessian mountains or hikes with the family. His articles deal with Apple products, news from the world of drones or solutions for current bugs.