Same issue with raspi serial 000000006f06a56b (I also used 000000006f06a56bA and 000000006f06a56bB) but still I got already registered.
Hi @Bernhard_Suttner , I’ve sent ou an email.
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Hi ricki-z ! I have a same problem!
My sensor arrived a few day ago, but it says the same message when registering. The chipID: 2925247
Thanks in advance. 
Hi @Rafeee, did you use the NodeMCU module before? The chipID is registered since 2021 by a user in Poland. But it seems like the NodeMCU was offline for more than 11 months and is online again since 6 days.
Hi @ricki-z
Thank you for respond me!
I didn’t have a measuring system before.
I bought the (assembled) air pollution meter on August 30th and then received it on September 17th from a domestic company here in Hungary.
Hi @Rafeee could you please ask them if they had registered the device before?
(And please check again that there is no typo in the chipID.)
Hi Ricki-Z!
I checked twice the ID, it’s 2925247.
The company assembled the air pollution meter from purchased, in principle original parts. The equipment and parts are completely new. (or fakes, but we don’t know that, unfortunately) 
Hello! ricki-z I was also stupid enough to delete my sensor hence all I had to do was to rewrite the config… Tried to send an email to tech@sensor.community but got an error email back about mail delivery. I am now reaching out to you here. Can you please reset my sensor with the ID: ID: 13185050?
Thank you!
Hi @Rafeee I’ve released the chipID. YOu should be able to register it now.
Hi @pzoltan92 I’ve restored the device registration. So you don’t need to register it again.
Dear Ricki-z!
Thank you! I have it set! The upload is working.
Hi, can you release my chip ID? 16005377
Hi @Blazej_Gabrys I’ve released the chipID.
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Hi Ricki-z, I have the same problem with 13555516
Hi @garaboncias I’ve released the chipID.
Hi, I have repaired my sensor that was offline for quite a while and accidentally deleted it. Could you please release it so I could register again?
Sensor ID 7165823
Thanks!
Hello, I have a similar problem. I’ve handed over one of my sensors to a friend, but he’s not able to find a message with that information. Would it be possible to cancel the handover? The senzor ID is 10248898. Was there ever any idea to automatically cancel the handover after some time, if it was not accepted? Thanks ahead for a help!
Can you please release my ID too. I haven’t used it in years and now can’t re-register it.
Sensor ID 563835
Hi @Tomas_Richta can you send the the email address of your friend as a PM? I need this for verification.
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Hi, just setup new device but is already registered. Please reset ID 4494458. Thank you!