abbrev-suggest - how to use?

[Charles Millar]

emacs version GNU Emacs 28.0.50 (build 344, x86_64-pc-linux-gnu, GTK+ 
Version 3.24.23, cairo version 1.16.0) of 2020-12-31

I have a butter "learnabbrev.txt" open with abbrev-mode enabled,

and in my init file,

(setq abbrev-suggest t)
(setq abbrev-suggest-hint-threshold 0).

My (global-abbrev-table) includes:

"foo"        1    "find outer otter"

(I checked to make sure that foo expanded to "find outer otter.")

When I start to enter "find outer otter," and no matter how many letters 
I enter, including the entire phrase, there are no suggestions in the 
echo area.

If I understand the info entries for abbrev-suggest and 
abbrev-suugest-hint-threshold, should not a hint show in the echo area, 
even after I type the first "f?"

Best,

Charlie Millar