Cannot Add Links on Pages

Hello, I am trying to create a page and for some reason adding links are disabled. I do not even have the option of clicking on the icon. I have tried to add links using html in the “text” section, but when I save and preview, the links disappear.

I have checked my post section and I am also not able to add a link to a standard post there.

For reference, I have just switched from wordpress.com and this is my first post/page on the new account. I have included the page in question below, you can see in the source the links are formatted right, they are just not showing up.

https://www.seekingsunshine.com/denmark/

Thank you!