I looked on the Apple site under storage and I no longer see time capsules available.
The Time Capsule and other AirPort routers were discontinued by Apple a year ago, in April 2018.
Apple offers no information or advice about possible replacement products, but a number of users on this forum have noted that the higher end Asus routers and Synology router do offer products that will allow the user to connect a USB hard drive for Time Machine backups.
I think I need to replace my 2TB flat top one as it several years old and will no longer do a daily back up of my macbook pro, although it works fine on my iMac.
This is not a Time Capsule problem, it is a problem with communications between your MacBook Pro and Time Capsule or the actual backup file of the MacBook Pro. In other words, if the Time Capsule works with one Mac, it will work with another if the settings are correct on the Mac and the backup file has not become corrupted.
Not sure if you want to try to troubleshoot this issue or not.
However.....if you are saying that you have an older "flat" or "square" version of the Time Capsule that looks like a small white pizza box with rounded corners, then this product is at least 5 years old and likely older, so it is probably due for replacement soon.
If you could provide the model number of Time Capsule.......located on the bottom of the device, usually embedded in the foam pad base, we can tell you more about the age of your Time Capsule. The model number starts with an "A" followed by 4 numbers.......like "A1409" for example.