From around 21:10 CET today, Snowflake began having availability issues in the EU region.
https://community.snowflake.com/s/group/0F90Z000000U8dJ/alerts-awseu-frankfurt
[Update 21:33 CET -- They have discovered the cause and are working on a remedy]
[Update 21:42 CET -- Service is now fully restored in the EU region]