The Pole and the Belgian finished runners-up after they were beaten 10-12, 8-11, 11-8, 7-11 by Russia's Lev Katsman and Maksim Grebnev in the championship match.
Dyjas' silver was the only medal for Poland at the championships, which ended in its capital on Sunday.
Some of Europe’s top table tennis players descended on Warsaw to compete in the continental championships after a delay due to the coronavirus pandemic.
The event featured more than 200 male and female competitors from 20 countries, among them Poland's multiple Olympian and Paralympian Natalia Partyka.
Natalia Partyka. Photo: PAP/Andrzej Grygiel
Germany's Timo Boll defended his men's singles title, while countrywoman Petrissa Solja claimed her maiden women's singles title.
Germany's Timo Boll, 40, celebrates winning his eighth career European men's singles title in Warsaw on Sunday. Photo: PAP/Piotr Nowak
The European Table Tennis Championships, originally scheduled for September last year, were held in the Polish capital from June 22 to 27.
Image: pzts.pl
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Source: PAP, pzts.pl, ettu.org