I have this plugin installed on several sites. On two sites, I have updated Buddy Press to the latest version no email ever gets sent out. On sites where I have not updated to the newest version of Buddy Press the emails still go out. Almost all other plugins on each of these sites are consistent.

I tested a number of times, deactivating almost all plugins and try to send new notifications and the emails never go out. All other emails from WordPress do go out. I have an Email Log plugin also running on the test site as a 3rd way of verifying emails being sent out and it shows WordPress, Gravity Forms, and BuddyPress emails going out perfectly fine. The only emails that don’t seem to get sent out are emails from this plugin.

Both sites including the ones it still works in are on the same server.

System Report

### Gravity Forms ###

Version: 2.5.6 ✔
Upload folder: /var/www/vhosts/caregiving.org/httpdocs/wp-content/uploads/gravity_forms/
Upload folder permissions: Writable  ✔
Output CSS: Yes
Output HTML5: No
No-Conflict Mode: Yes
Currency: USD
Background updates: Yes
REST API v2: No
Registration: Site registered ( d4bd722d-d212-4bb2-81d0-a1961c8ceda9 )  ✔

### Database ###

Database Version: 2.5.6  ✔ Your database is up-to-date.
7UX9kg1_gf_form_view:   ✔
7UX9kg1_gf_form_meta:   ✔
7UX9kg1_gf_form:   ✔
7UX9kg1_gf_form_revisions:   ✔
7UX9kg1_gf_entry:   ✔
7UX9kg1_gf_entry_meta:   ✔
7UX9kg1_gf_entry_notes:   ✔
7UX9kg1_gf_draft_submissions:   ✔

### Translations ###

Site Locale: en_US
User (ID: 1) Locale: en_US
Gravity Forms: 

### WordPress ###

Home URL: https://www.caregiving.org
Site URL: https://www.caregiving.org
REST API Base URL: https://www.caregiving.org/wp-json/
WordPress Version: 5.7.2 ✔
WordPress Multisite: No
WordPress Memory Limit: 512M
WordPress Debug Mode: No
WordPress Debug Log: No
WordPress Script Debug Mode: No
WordPress Cron: Yes
WordPress Alternate Cron: No
Background tasks: Yes  ✔

### Active Theme ###

Divi Child: by Elegant Themes (https://www.elegantthemes.com) - 1.0.0  ✔
Divi (Parent): by Elegant Themes (http://www.elegantthemes.com) - 4.9.7  ✔

### Active Plugins ###

Add From Server: by Dion Hulse - 3.4.5  ✔
Ask the Egghead Custom Plugin: by Ask the Egghead Inc. - 1.0  ✔
bbPress: by The bbPress Contributors - 2.6.6  ✔
Beehive Pro: by WPMU DEV - 3.3.10  ✔
BP Group Documents: by lenasterg - 1.12.3  ✔
BP Registration Options: by Pluginize - 4.3.9  ✔
BuddyPress: by The BuddyPress Community - 8.0.0  ✔
BuddyPress Auto Join Groups: by BuddyDev - 1.0.3  ✔
BuddyPress Automatic Friends: by Steven Word - 2.0.7  ✔
BuddyPress Follow: by Andy Peatling, r-a-y - 1.3-alpha  ✔
BuddyPress Global Search: by BuddyBoss - 1.2.1  ✔
BuddyPress Member Types Pro: by BuddyDev - 1.4.1  ✔
BuddyPress Xprofile Custom Field Types: by BuddyDev - 1.1.9  ✔
Comet Cache: by WP Sharks - 170220  ✔
Defender Pro: by WPMU DEV - 2.5.4  ✔
Directories: by SabaiApps - 1.3.75  ✔
Directories Pro: by SabaiApps - 1.3.75  ✔
Divi Bars: by Divi Life — Tim Strifler - 1.8.6.1  ✔
Divi Booster: by Dan Mossop - 3.5.1  ✔
Divi Flip Cards: by B3 Multimedia Solutions - 1.1.2  ✔
Email Log: by Sudar - 2.4.5  ✔
Enable Media Replace: by ShortPixel - 3.5.0  ✔
GD bbPress Attachments: by Milan Petrovic - 4.2  ✔
Gravity Divi - Gravity Forms Styler for Divi: by Divi Codex - 2.1.0  ✔
If Menu - Visibility control for menu items: by Layered - 0.16.2  ✔
Image Map Pro: by Webcraft Plugins Ltd. - 4.0.8  ✔
Our Team Showcase: by Smartcat - 4.4.2  ✔
Our Team Showcase Pro: by Smartcat - 4.4.2  ✔
Page Links To: by Mark Jaquith - 3.3.5  ✔
Popup Maker: by Popup Maker - 1.16.1  ✔
Redirection: by John Godley - 5.1.1  ✔
SmartCrawl Pro: by WPMU DEV - 2.11.0  ✔
TaxoPress: by TaxoPress - 3.0.7.1  ✔
W3Speedup: by W3speedup - 6.77  ✔
WP Mail SMTP: by WPForms - 2.9.0  ✔
WPMU DEV Dashboard: by WPMU DEV - 4.11.1  ✔
Youzer: by Youssef Kaine - 2.6.2  ✔

### Web Server ###

Software: Apache
Port: 443
Document Root: /var/www/vhosts/caregiving.org/httpdocs

### PHP ###

Version: 7.4.20 ✔
Memory Limit: 512M
Maximum Execution Time: 180
Maximum File Upload Size: 512M
Maximum File Uploads: 20
Maximum Post Size: 512M
Maximum Input Variables: 1000
cURL Enabled: Yes (version 7.77.0)
OpenSSL: OpenSSL 1.0.2k  26 Jan 2017 (268443839)
Mcrypt Enabled: No
Mbstring Enabled: Yes
Loaded Extensions: Core, date, libxml, openssl, pcre, zlib, bz2, calendar, ctype, hash, filter, ftp, gettext, gmp, SPL, iconv, pcntl, readline, Reflection, session, standard, SimpleXML, sockets, mbstring, tokenizer, xml, cgi-fcgi, mysqlnd, bcmath, curl, dba, dom, enchant, fileinfo, gd, imagick, imap, intl, json, ldap, exif, mysqli, odbc, PDO, pdo_mysql, PDO_ODBC, pdo_pgsql, pdo_sqlite, pgsql, Phar, posix, pspell, redis, soap, sodium, sqlite3, sysvmsg, sysvsem, sysvshm, tidy, xmlreader, xmlrpc, xmlwriter, xsl, zip, ionCube Loader, Zend OPcache

### Database Server ###

Database Management System: MariaDB
Version: 10.1.48 ✔
Database Character Set: utf8
Database Collation: utf8_general_ci

### Date and Time ###

WordPress (Local) Timezone: America/New_York
MySQL (UTC): 2021-06-29 14:25:18
MySQL (Local): June 29, 2021 at 10:25 am
PHP (UTC): 2021-06-29 14:25:18
PHP (Local): June 29, 2021 at 10:25 am