Reported on another airline news site:
Portuguese authorities have told Ryanair that the carrier must not refuse boarding to passengers with paper boarding passes, warning that it would be in violation of EU air passenger rights.
Earlier this week, Ryanair implemented its new digital-only boarding pass policy, requiring all passengers to check in online and use the Ryanair app to receive their digital pass. Although almost all passengers today have smartphones, the airline says it will still accommodate those without smartphones or other special requirements at no extra charge.