failed attempt to access my saved library on Adobe Firefly

Hello @Frederico15D5,

Thank you for your message. I am sorry you are having this problem. 

In this document, Everything You Wanted To Know About Saving Images From Firefly Text to Image (specifically the highlighted section):

Save to Library

You can save your images to your Creative Cloud library. You can use this option if you plan to use the image in other Adobe applications or if you need to access the image from multiple computers and devices.  You save it to the Creative Cloud library by selecting Save to Library from the Share menu on the lower right corner of the image:

Once you click on Save to Library, you will get a dialogue box asking what folder you want to save the image in.

If you plan to save this and all images in the same folder, you can click on Set as default library. If you do that, further saves will be stored in that folder without prompting.  If you want to change the folder later, click on save, and you will see this green box at the bottom of the browser window if it successfully saved:

Click on Change and it will prompt you for the folder you want to save in.

Q: I saved to my Creative Cloud library, but I do not see them there.

A: You would have specified which folder you want to save them in when you saved them (or previously specified a default). Look in the folders in your creative cloud account for them or alternatively, if you follow the steps in the section above on saving to library for changing the default folder, you will see what folder it has been saving them in by default.

My best,
    droopy