Errormessage for user: "The page cannot be displayed because HTTP version is not supported."

Hello communitiy,

some of new users get the error message: "The page cannot be displayed because HTTP version is not supported."  after clicking on SMS or phone button in the registration process.

We have no clue, why this happend.

Did anybody any idea, what the reason can be? 

We have 40 users from one customer where it is ok, but 2 are getting this message.

Is there an issue for some countries? 

Today for example, error messages from users from Romania.

We will be happy, if someone as any idea about this error.

Thanks for feedback in advance.

We are running Passwordmanager version 5.9.3.109 at the moment.

We hope, that with the upgrade last time, the error would be disappear. Unfortunately not.

I could find any hints in the latest release notes.

Kind regards

Michael from Germany.

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