No, there's no change with the cover. I'm thinking maybe it's a change in the computer algos since the book was published 3 yrs ago?
edit} I should add, the hardcover with the adapted hardcover from 3yrs back worked fine. It's really odd.

I recently changed my company imprint name and address. So my paperback was changed with just the title information. Now Amazon says the spine:
"Reduce the size of your spine text in your cover file. Spine text needs at least 0.0625" (1.6 mm) space on either side so that it doesn't wrap onto the front or back cover"

But it's the same cover???

I tried to increase the size of the book by 10 pages. That didn't work. Does the actual cover need to be altered? And why was it accepted before?

I would call them and tell them it's the same cover. See what they say.

Not finding a promo that suits your book? You want to experiment with running your own. From personal experience, I can tell you that it does take a little time--people will sometimes submit crazily off-theme books, so you have to keep an eye open. But if there are other people on BF with similar books, it might give you a venue for them. If there aren't, it will likely flop, but there's no way to know without trying.

Thanks Bill. You're absolutely right. And it's only $10/month so no huge investment.

I recently changed my company imprint name and address. So my paperback was changed with just the title information. Now Amazon says the spine:
"Reduce the size of your spine text in your cover file. Spine text needs at least 0.0625" (1.6 mm) space on either side so that it doesn't wrap onto the front or back cover"

But it's the same cover???

I tried to increase the size of the book by 10 pages. That didn't work. Does the actual cover need to be altered? And why was it accepted before?

The substack option does sound appealing because it's free. But I get what you're saying about content. And since I don't want to contribute shorts at the moment, I'm not changing to it. But I bet a lot of writers are just simply using it as a free email service. I wonder.

I took a look at EmailOctopus. It's affordable, but still more than Mailerlite for my 2500-5000 plan. Mailerlite never forced me to change from their old plan so I still get the old pricing--could be more worth it it to change over if you're just building your readers/fans though.