Hi there,
The Pynq-Z2 has a 32-bit arm processor on it, so if you need to run tensorflow on it you need to compile it from source or find a project that ships these binaries for that architecture.
There are some relevant posts on this Error install Tensorflow - #8 by gnatale Tensorflow and keras on pynq z2 hopefully you will find some of the links there helpful.
Thanks
Shawn