yml syntax clarification

[sjdeere]

composer install of ss 3.1.15 with userforms

I can get Mathspam module to work.

---
name: spamprotection

---
FormSpamProtectionExtension:
  default_spam_protector: MathSpamProtector

I thought I would try Mollom.
But noting is showing in the admin regarding Mollom.
dev/build?flush=1
admin?flush=1

Trying to spot what could be wrong?
How should i be declaring FormSpamProtectionExtension in the yml file?

I notice your docs show FormSpamProtectionExtension::
The Math spam docs show FormSpamProtectionExtension:

2 colons or not?

---
name: spamprotection

---
FormSpamProtectionExtension::
  default_spam_protector: MollomSpamProtector
Mollom:
  public_key: dont8publish7mypublic0key5
  private_key: dont8publish7myprivate0key5

or

---
name: spamprotection

---
FormSpamProtectionExtension:
  default_spam_protector: MollomSpamProtector
Mollom:
  public_key: dont8publish7my0key5
  private_key: ont8publish7myprivate0key5