Export to Omeka S seems not to work

[amendesd]

The issue appears to be the same as the one reported in the following message:

Export to omeka s - options not saving

Hello, In the Export to Omeka S plugin (2.0.0), after I enter the data in the api url and keys fields, they are not retained. Only the name is saved. The API URL reverts to the default http://<omeka_url>/api. I tried to export anyway, and the log showed: {“level”:30,“time”:1605825797489,“type”:“renderer”,“name”:“project”,“plugin”:“tropy-plugin-omeka”,“msg”:“Connecting to API…”} {“level”:50,“time”:1605825799795,“type”:“renderer”,“name”:“project”,“plugin”:“tropy-plugin-omeka”,“stack”:“TypeError…

The log file shows: {“level”:50,“time”:1636755164564,“type”:“renderer”,“name”:“project”,“plugin”:“tropy-plugin-omeka”,“stack”:“TypeError: Failed to fetch”,“msg”:“Could not connect to API: http://<omeka_url>/api”}.
Thanks for your help