There is probably a technical problem with SunExpress Airlines' system if you were unable to complete your check-in because of a PSS Operation Exception error.
Changing devices or refreshing them frequently doesn't fix things. The easiest way to get assistance is to speak with SunExpress directly.
In addition to calling +44 208 157 9797 from the UK and +31 970 102 69797 from other European nations, you can contact them worldwide via WhatsApp at +90 232 444 0797. They offer assistance in English.
If the issue continues, share your experience and think about submitting a complaint on Xolvie to find a solution.
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I can't check in online