While I'm using the app...
I cannot click a link in a post. I will get a message similar to yours every time.
I must copy the link and then paste it in my browser.
Please try this if you understand what I'm saying if not tell me and I'll take a screen record video to show you when I'm saying.
Try this.
Try replying to the first post...
When you click reply it will insert that first post into your message but don't do anything... I mean don't hit post or don't type a reply.
While that first post is sitting in the reply box highlight the Google sheet link then right click and copy it...