Did your phone successfully read the Spark without the VivoKey app installed before, and does not any longer?
My impression is that the Spark cannot be scanned like a normal tag, without an app configured to read it, because it is an ISO15693 tag with read-only NDEF records that allow it to access the VivoKey platform. It’s not like the other ISO14443a compliant chips. Here’s a post detailing some of its properties (might be slightly outdated, since it’s from February):