Invalid ISSN error message

@vvucic wrote:

Hello, When I enter the ISSN number in appropriate field I always get message that it is invalid ISSN number.

ISSN 0350‑1426
I put it without dash, with dash etc. but I always get error message that says that ISSN is invalid. When I put that number in Google I found it in many registers for the journal. Please advise

Thanks

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