Wacom not clicking in iCloud Mail and Notes

Apple icloud website: wacom not clicking properly

I am using Apple iCloud's website for email, Notes and other apps.

I use a Wacom Intuos BT S instead of a mouse, although I always have a mouse connected for other users.

I am using several computers, macOS and Linux, with the tablet. The tablet works fine in any other website or software. This is the only place where I have issues.

When I try to click on an email to open it on the side panel, it doesn't work. I leave the pointer where it is and use the mouse instead, and it works normally.

I have similar issues in the Notes app, when I click into a note to type on it, the cursor doesn't appear. I use the mouse and it works.

When I click, I do it careful not to drag and avoid the website to do a "drag and drop".

Can anyone help?

Thank you very much in advance