Fake Lucidchart / Lucidspark diagramming and whiteboard subscription payment failed, team diagrams inaccessible, or shared boards and content suspended phishing

Phishing emails impersonating Lucidchart or Lucidspark claiming the subscription payment has failed, team diagrams are inaccessible, shared boards are suspended, or diagramming content will be locked — directing them to update billing or restore their subscription through a credential-harvesting portal. Distinct from Miro/Mural visual collaboration billing phishing (which targets collaborative whiteboard tools) — this targets technical diagramming and architecture documentation tools with different use cases and user demographics. Key facts: (1) Lucidchart serves 30,000,000+ registered users with 25,000,000+ paying users ($7.95-9/month Individual/Team, $20+/user/month Enterprise) — Lucidchart is the default technical diagramming tool for software architecture diagrams, network topology charts, org charts, UML diagrams, ER diagrams, and business process flows; when a Lucidchart Team subscription lapses, all team-shared diagrams become inaccessible, including architecture documentation, infrastructure diagrams, and process flow charts that engineering and operations teams reference constantly; (2) Lucidchart's integration with Confluence, Jira, Google Workspace, and Microsoft 365 means billing suspension breaks embedded diagrams in documentation wikis — all Lucidchart diagrams embedded in Confluence pages show as broken, all Google Docs with embedded diagrams lose their visual content; (3) Lucidspark (Lucid's collaborative whiteboard product) serves teams who use it for sprint planning, brainstorming, and design thinking workshops — a 'your Lucidspark shared boards are suspended' email before a scheduled design sprint creates extreme urgency; (4) Architecture diagrams created in Lucidchart often represent months of work documenting system architecture, data flows, and infrastructure topology — 'your team diagrams will be suspended' threatens not just access to a tool but access to the organization's technical memory; (5) Lucidchart credentials expose all team diagrams including unreleased system architecture, network topology (which may reveal infrastructure security posture), organizational charts, and acquisition/expansion planning diagrams. Warning signs: sender not lucidchart.com/lucidspark.com/lucid.app; genuine Lucidchart billing at lucid.app/billing.