[9nGQluzmnq3M]

Were you using some minor bus company? To a first approximation, all Japanese IC cards are compatible these days.

https://en.wikipedia.org/wiki/Suica#Interoperation

[munmaek]

Actually on second thought, this happened in Fukuoka, not Osaka. In Osaka I was able to take the metro with Suica.

I ended up carrying around cash and change anyway since a lot of places in Tokyo were still cash only.